Updates to UserAccessController and UserAccess.page. Plus tests.

Created UserAccessController2 and UserAccess2  plus test class - we can decide how to merge best parts of each.

Added ability to directly query for UserRecordAccess with one button click
-- logic to get all user results (limited to 99 since SOQL limit) if no query specified
-- logic to query only selected users from list

![screen shot 2013-10-10 at 2 00 21 am](https://f.cloud.github.com/assets/2161427/1304860/6d4eef86-318a-11e3-818e-7f4af2e37765.png)